rka-oai 768330dd6c Add a fallback phase before automatic context rollover (#33255) ...

## Why

Token-budget sessions need a final opportunity to preserve important state before the current context is compacted.

## What changed

- When `auto_compact_fallback_prompt` is configured, reserve `auto_compact_fallback_buffer_tokens` beyond the base auto-compaction limit.
- At the base limit, inject the fallback prompt once as a developer message while keeping the normal tool surface available. Continue reporting zero base-window tokens during this reserve.
- Roll over when the reserve or full model context is exhausted, and skip the fallback when a new context was already requested.

## Testing

Added coverage for using the fallback reserve, rolling over after it is exhausted, and bypassing the fallback for an explicit `new_context` request.

GitOrigin-RevId: 32983ecadc5cb4927e15ecd7b1e896cb52a9ad3b

2026-07-15 05:45:43 +00:00

..

snapshots

Update models.json (#21818)

2026-07-08 16:24:12 -07:00

abort_tasks.rs

Pair thread environment settings (#26687)

2026-06-08 13:55:15 -07:00

additional_context.rs

Pair thread environment settings (#26687)

2026-06-08 13:55:15 -07:00

agent_execution.rs

Namespace multi-agent v2 tools under collaboration (#29067)

2026-06-23 14:15:20 +02:00

agent_jobs.rs

[codex] Use expect in integration tests (#28441)

2026-06-15 21:53:47 -07:00

agent_websocket.rs

Require prefixes for outbound response item IDs (#32312)

2026-07-11 02:29:14 +00:00

agents_md.rs

Scope runtime workspace roots to execution environments (#32952)

2026-07-14 04:41:08 +00:00

apply_patch_cli.rs

Scope runtime workspace roots to execution environments (#32952)

2026-07-14 04:41:08 +00:00

approvals.rs

Keep approval test targets in the temporary home (#33185)

2026-07-14 22:31:57 +00:00

auto_review.rs

Respect model support for reasoning summaries (#32290)

2026-07-10 23:39:21 +00:00

catalog_permission_messages.rs

Support model catalog permission messages (#33147)

2026-07-14 20:14:29 +00:00

cli_stream.rs

Update models.json (#31684)

2026-07-09 03:40:08 +00:00

client_websockets.rs

Honor workspace spend controls in rate-limit handling (#33187)

2026-07-14 22:43:26 +00:00

client.rs

Honor workspace spend controls in rate-limit handling (#33187)

2026-07-14 22:43:26 +00:00

code_mode_elicitation.rs

code-mode: make all approvals trigger elicitation pause (#31650)

2026-07-08 15:27:04 -07:00

code_mode.rs

code-mode: fall back to using in process v8 if we fail to resolve external process (#31899)

2026-07-09 14:40:10 -07:00

codex_delegate.rs

Revert "[core] Support interleaved response items" (#31261)

2026-07-06 10:09:54 -07:00

collaboration_instructions.rs

Pair thread environment settings (#26687)

2026-06-08 13:55:15 -07:00

compact_remote_parity.rs

Stabilize remote compaction parity against dynamic skill catalogs (#31585)

2026-07-08 15:59:36 +01:00

compact_remote.rs

Update models.json (#21818)

2026-07-08 16:24:12 -07:00

compact_resume_fork.rs

Support openai/form extended form elicitations (#27500)

2026-06-18 11:54:49 -07:00

compact.rs

Broaden remote compaction model fallback (#32881)

2026-07-13 21:54:04 +00:00

current_time_reminder.rs

[codex] impl delivery_mode: current time reminders on response boundaries (#30033)

2026-06-25 19:28:50 +00:00

deprecation_notice.rs

Add indexed web search mode (#28489)

2026-06-19 05:35:57 -07:00

exec_policy.rs

Preserve managed exec policy after rules parse errors (#31188)

2026-07-06 19:28:44 -07:00

exec.rs

Add network environment ID plumbing (#28766)

2026-06-18 14:09:38 +02:00

extension_sandbox.rs

Use the image generation extension by default (#31596)

2026-07-09 12:25:19 +09:00

external_auth.rs

[codex] Add externally provided Codex auth (#31274)

2026-07-07 17:43:19 -07:00

fork_thread.rs

Share resumed rollout history (#28426)

2026-06-23 10:23:25 -04:00

guardian_review.rs

Support model catalog templates for Guardian policy prompts (#33177)

2026-07-14 22:01:11 +00:00

hooks_mcp.rs

Represent MCP authentication with an enum (#29924)

2026-06-24 19:51:51 -07:00

hooks.rs

Route blocked network requests to their owning calls (#32897)

2026-07-13 23:33:58 +00:00

image_rollout.rs

feat(core): store turn_id on ResponseItem metadata (#28360)

2026-06-22 16:45:14 -07:00

items.rs

Use the image generation extension by default (#31596)

2026-07-09 12:25:19 +09:00

json_result.rs

Pair thread environment settings (#26687)

2026-06-08 13:55:15 -07:00

live_cli.rs

[codex] Use expect in integration tests (#28441)

2026-06-15 21:53:47 -07:00

mcp_auth_elicitation.rs

[codex] Enable auth elicitation by default (#28772)

2026-07-07 11:48:27 -07:00

mcp_auth_refresh.rs

Reuse MCP tool catalogs across sessions (#33184)

2026-07-14 22:25:39 +00:00

mcp_refresh_cleanup.rs

Pin MCP runtimes to model steps (#30101)

2026-06-26 00:53:07 +01:00

mcp_tool_cache.rs

Reuse MCP tool catalogs across sessions (#33184)

2026-07-14 22:25:39 +00:00

mcp_tool_exposure.rs

Make Apps guidance react to MCP availability (#30226)

2026-07-06 14:29:19 -07:00

mcp_turn_metadata.rs

[codex-rs] Add writes app approval mode (#30482)

2026-07-07 13:13:59 -04:00

mod.rs

Reuse MCP tool catalogs across sessions (#33184)

2026-07-14 22:25:39 +00:00

model_overrides.rs

[5 of 7] Replace OverrideTurnContext with ThreadSettings (#22508)

2026-05-18 21:03:51 -07:00

model_runtime_selectors.rs

Use the image generation extension by default (#31596)

2026-07-09 12:25:19 +09:00

model_switching.rs

Respect model support for reasoning summaries (#32290)

2026-07-10 23:39:21 +00:00

model_visible_layout.rs

Scope runtime workspace roots to execution environments (#32952)

2026-07-14 04:41:08 +00:00

models_cache_ttl.rs

Respect model support for reasoning summaries (#32290)

2026-07-10 23:39:21 +00:00

models_etag_responses.rs

Pair thread environment settings (#26687)

2026-06-08 13:55:15 -07:00

multi_agent_mode.rs

Make explicit multi-agent mode override proactive delegation (#32822)

2026-07-13 15:39:24 +00:00

multi_agent_resume.rs

Restore V2 agent identities on root thread resume (#32837)

2026-07-13 17:24:10 +00:00

network_approval.rs

Scope runtime workspace roots to execution environments (#32952)

2026-07-14 04:41:08 +00:00

openai_file_mcp.rs

[codex-apps] Filter optional file fields by tool schema (#31686)

2026-07-09 14:32:23 -07:00

otel.rs

Revert "[core] Support interleaved response items" (#31261)

2026-07-06 10:09:54 -07:00

override_updates.rs

Pair thread environment settings (#26687)

2026-06-08 13:55:15 -07:00

pending_input.rs

Move sleep items to the extension-owned lifecycle path (#33159)

2026-07-14 21:01:54 +00:00

permissions_messages.rs

Support model catalog permission messages (#33147)

2026-07-14 20:14:29 +00:00

personality.rs

Support model catalog permission messages (#33147)

2026-07-14 20:14:29 +00:00

plugins.rs

Make Apps guidance react to MCP availability (#30226)

2026-07-06 14:29:19 -07:00

prompt_cache_key.rs

Use session IDs for prompt cache keys (#33035)

2026-07-14 10:37:23 +00:00

prompt_caching.rs

feat(core): store turn_id on ResponseItem metadata (#28360)

2026-06-22 16:45:14 -07:00

prompt_debug_tests.rs

feat(core): store turn_id on ResponseItem metadata (#28360)

2026-06-22 16:45:14 -07:00

quota_exceeded.rs

Pair thread environment settings (#26687)

2026-06-08 13:55:15 -07:00

realtime_conversation.rs

[codex] Flush trailing realtime transcript tail (#29918)

2026-07-06 14:12:54 -07:00

remote_env.rs

Defer Noise environment connections until registration (#33166)

2026-07-14 21:07:27 +00:00

remote_models.rs

Respect model support for reasoning summaries (#32290)

2026-07-10 23:39:21 +00:00

request_compression.rs

Pair thread environment settings (#26687)

2026-06-08 13:55:15 -07:00

request_permissions_tool.rs

[codex] Use expect in integration tests (#28441)

2026-06-15 21:53:47 -07:00

request_permissions.rs

Separate exec permission paths from core models (#33200)

2026-07-15 01:31:40 +00:00

request_plugin_install.rs

[plugins] Track plugin install requests by ID (#29684)

2026-06-24 21:29:11 +00:00

request_user_input.rs

[codex] Use expect in integration tests (#28441)

2026-06-15 21:53:47 -07:00

responses_api_proxy_headers.rs

Pair thread environment settings (#26687)

2026-06-08 13:55:15 -07:00

responses_lite.rs

Use the image generation extension by default (#31596)

2026-07-09 12:25:19 +09:00

resume_warning.rs

Include terminal errors in turn completion events (#32280)

2026-07-10 22:04:03 +00:00

resume.rs

Update models.json (#21818)

2026-07-08 16:24:12 -07:00

review.rs

feat(core): emit canonical review mode items (#31473)

2026-07-08 09:59:50 -07:00

rmcp_client.rs

Reuse MCP tool catalogs across sessions (#33184)

2026-07-14 22:25:39 +00:00

rollout_budget.rs

Stabilize shared rollout budget test (#31587)

2026-07-08 16:10:28 +01:00

rollout_list_find.rs

Support thread-level originator overrides (#29477)

2026-06-23 17:23:38 -07:00

safety_buffering.rs

[codex] Read retry model from buffering events (#31262)

2026-07-06 17:04:26 +00:00

safety_check_downgrade.rs

Update models.json (#21818)

2026-07-08 16:24:12 -07:00

search_tool.rs

[codex] Restore v1 delegation guidance (#30511)

2026-06-28 20:34:47 -07:00

shell_command.rs

test: branch on target OS instead of runner flavor (#29712)

2026-06-23 14:27:13 -07:00

shell_serialization.rs

test: branch on target OS instead of runner flavor (#29712)

2026-06-23 14:27:13 -07:00

shell_snapshot.rs

[codex] Use expect in integration tests (#28441)

2026-06-15 21:53:47 -07:00

skill_approval.rs

Pair thread environment settings (#26687)

2026-06-08 13:55:15 -07:00

skills.rs

core tests: rename automatic environment builder (#29728)

2026-06-23 21:45:06 +00:00

spawn_agent_description.rs

Respect model support for reasoning summaries (#32290)

2026-07-10 23:39:21 +00:00

sqlite_state.rs

Add ordinals to paginated rollout records (#32332)

2026-07-11 04:15:42 +00:00

stream_error_allows_next_turn.rs

Include terminal errors in turn completion events (#32280)

2026-07-10 22:04:03 +00:00

stream_no_completed.rs

Pair thread environment settings (#26687)

2026-06-08 13:55:15 -07:00

subagent_notifications.rs

Respect model support for reasoning summaries (#32290)

2026-07-10 23:39:21 +00:00

token_budget.rs

Add a fallback phase before automatic context rollover (#33255)

2026-07-15 05:45:43 +00:00

tool_harness.rs

[codex] Use expect in integration tests (#28441)

2026-06-15 21:53:47 -07:00

tool_parallelism.rs

[codex] Use expect in integration tests (#28441)

2026-06-15 21:53:47 -07:00

tools.rs

Preserve namespaces on custom tool calls (#30302)

2026-06-27 09:54:56 -07:00

truncation.rs

Represent MCP authentication with an enum (#29924)

2026-06-24 19:51:51 -07:00

turn_state.rs

[codex] Use expect in integration tests (#28441)

2026-06-15 21:53:47 -07:00

unified_exec_process_events.rs

perf(skills): reuse walk inventory for host loading (#31566)

2026-07-09 09:54:24 +01:00

unified_exec_zsh_fork_approvals.rs

Pair thread environment settings (#26687)

2026-06-08 13:55:15 -07:00

unified_exec.rs

Keep unified exec output collection bounded (#32150)

2026-07-10 12:22:04 +00:00

unstable_features_warning.rs

[codex] Remove child AGENTS.md prompt experiment (#28993)

2026-06-18 16:13:07 -07:00

user_notification.rs

Pair thread environment settings (#26687)

2026-06-08 13:55:15 -07:00

user_shell_cmd.rs

[codex] Warn clearly when code mode output is truncated (#28467)

2026-06-16 10:37:06 -07:00

view_image.rs

Scope runtime workspace roots to execution environments (#32952)

2026-07-14 04:41:08 +00:00

web_search.rs

Update models.json (#21818)

2026-07-08 16:24:12 -07:00

websocket_fallback.rs

Pair thread environment settings (#26687)

2026-06-08 13:55:15 -07:00

window_headers.rs

[codex] Use expect in integration tests (#28441)

2026-06-15 21:53:47 -07:00

windows_sandbox.rs

Add network environment ID plumbing (#28766)

2026-06-18 14:09:38 +02:00

workspace_roots.rs

Propagate workspace roots to exec-server sandboxes (#32214)

2026-07-10 16:55:01 +00:00